Semiconductor integrated circuit and an electronic apparatus incorporating a multiplicity of semiconductor integrated circuits

1. An electronic apparatus comprising: a multiplicity of operably connected semiconductor integrated circuits (ICs) arranged on a substrate which operate at different operating voltages, wherein all the interface voltages between operably connected ICs are the lowest operating voltage; and each of said ICs other than those operating at the lowest operating voltage is provided with: an input circuit for converting the lowest operating voltage of a signal input thereto from another IC to its own operating voltage; and an output circuit for converting the voltage of the signal to be output therefrom to the lowest operating voltage.

2. An electronic apparatus comprising: a multiplicity of operably connected semiconductor integrated circuits (ICs) arranged on a substrate which operates at different operating voltages, wherein the interface voltage between any two operably connected ICs operating at two operating voltages is the lower operating voltage of the two; and each of said ICs other than those operating at the lower operating voltage is provided with: an input circuit for converting a lower operating voltage of a signal input thereto from another IC to its own operating voltage; and an output circuit for converting the voltage of the signal to be output therefrom to a required lower operating voltage.